Abstract
Seawater and sea sand concrete (SWSSC) is a highly attractive alternative to normal concrete (NC) that requires huge amounts of fresh water and river sand. However, reinforcements of stainless steel (instead of mild steel that is used in NC) may be required for SWSSC. This article reports investigation of stress corrosion cracking (SCC) of AISI 316 stainless steel (SS) in simulated SWSSC and NC environments, with and without addition of silica to SWSSC and NC, employing slow strain rate testing (SSRT) at 25 and 60 °C. For the purpose of comparison, SCC of SS was also investigated in simulated seawater (SW) solution. SS showed no SCC at 25 °C in any of the test solutions. Indications of SCC were seen in SW at 60 °C, but no features of SCC in SWSSC and NC at 60 °C, as suggested by scanning electron microscopy (SEM) fractographs. While the absence of SCC in SWSSC and NC is attributed to the highly passivating alkaline condition, its absence in SWSSC also indicates the role of alkalinity to predominate the deleterious role of chloride content of SWSSC. However, the addition of silicate to SWSSC or NC triggers transgranular SCC to SS at 60 °C, as evidenced by the fractography.
Highlights
Increasing population and industrial development cause a rapid increase in the demand of concrete
The alkali-silica reaction has a detrimental effect on integrity of ordinary Portland cement concrete [9,10], whereas the geo-polymer concrete or the high-performance concrete that utilizes industrial waste materials such as fly ash or slag, instead of cement, is designed to reduce effect of the alkali-silica reaction
Though stress corrosion cracking (SCC) of austenitic stainless steel (SS) in chloride and caustic solutions has been investigated considerably (e.g., [21,22,23,24,25]), influence of silicate, a constituent of concrete, on SCC has by slow strain rate testing (SSRT)
Summary
Increasing population and industrial development cause a rapid increase in the demand of concrete. There is great interest in seawater sea sand concrete (SWSSC), including in hybrid construction In such applications, stainless steels (SS) are potential material for reinforcing bars or tubes. This paper investigates stress corrosion cracking of AISI 316 SS in different environment relevant to SWSSC, with and without silicate, by slow strain rate testing (SSRT). Though SCC of austenitic SS in chloride and caustic solutions has been investigated considerably (e.g., [21,22,23,24,25]), influence of silicate, a constituent of concrete, on SCC has by slow strain rate testing (SSRT). This study investigates the role of a typical silicate addition to simulated concrete solutions in stress corrosion cracking of anuosttebneeitnicinstvaeisntilgeasste-dsteealrlbiearr.sT.
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